linux-kernel - Re: [PATCH 6/6] Makes procs file writable to move all threads by tgid at once

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Message-ID: <20090806153756.GC6747@linux.vnet.ibm.com>
Date:	Thu, 6 Aug 2009 08:37:56 -0700
From:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc:	Paul Menage <menage@...gle.com>, Benjamin Blum <bblum@...gle.com>,
	containers@...ts.linux-foundation.org,
	linux-kernel@...r.kernel.org, akpm@...ux-foundation.org,
	Ingo Molnar <mingo@...e.hu>, oleg <oleg@...hat.com>
Subject: Re: [PATCH 6/6] Makes procs file writable to move all threads by
	tgid at once

On Thu, Aug 06, 2009 at 05:24:46PM +0200, Peter Zijlstra wrote:
> On Thu, 2009-08-06 at 08:19 -0700, Paul E. McKenney wrote:
> > 
> > > So yes, putting a rwsem in there sounds fine, you're already bouncing
> > > it.
> > 
> > If the critical section is small, is an rwsem really better than a
> > straight mutex?
> 
> Well, my understanding was that it needed to surround much, if not all,
> of clone(). That's a rather large bit of code.

That would indeed justify an rwsem!  ;-)

							Thanx, Paul
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